headspace

As the title states, does anyone know which Hornady Headspace Comparator should be used with the 6.5 PRC? Many thanks.

How would full-length sizing a case increase the headspace measurement on a .223 case, and charging/seating/crimping decrease the headspace measurement?? This weekend, I started taking headspace measurements on some 223 cases in my stockpile in various states on the way to being reloaded, in...

Here is what I think is likely a very simple problem I am having. I'm a fairly experienced reloader, but hopefully the real gurus here can help me out. I have a 35 Whelen built on a 1903-A3 action. It was not a rebarrel, but a rebore by Dan Pendersen at Classic Barrel & Gunworks in AZ. I am...